/* SendHub landing — shared shell: tokens, mesh page bg, floating nav, CTAs, footer. */
/* Plus Jakarta Sans + JetBrains Mono (premium pairing; extension UI remains Inter in /src). */

:root {
  --ink-300: #94a3b8;
  --ink-400: #64748b;
  --ink-500: #475569;
  --ink-700: #334155;
  --ink-900: #0f172a;

  --paper-50: #f8fafc;
  --paper-100: #f1f5f9;
  --paper-200: #e2e8f0;
  --line: #e2e8f0;

  --accent-50: hsl(220 84% 96%);
  --accent-500: hsl(220 84% 58%);
  --accent-600: hsl(220 86% 52%);

  /* Tinted shadow (not pure black) */
  --shadow-card: 0 4px 24px rgba(15, 23, 42, 0.07);
  --shadow-elev: 0 20px 50px -12px rgba(15, 23, 42, 0.14);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.75);

  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, Monaco, Consolas, monospace;

  --radius-squircle: 1.5rem;
  --radius-pill: 999px;
  --container: min(1120px, 100% - 2rem);

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 0.2s;
  --t-med: 0.55s;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

html, body { min-height: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink-900);
  font-size: 15px;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
  z-index: 0;
  background-color: var(--paper-50);
  background-image:
    radial-gradient(1000px 520px at 14% -8%, rgba(37, 99, 235, 0.08), transparent 60%),
    radial-gradient(880px 480px at 98% 12%, hsl(220 84% 96% / 0.9), transparent 55%),
    radial-gradient(700px 400px at 50% 100%, rgba(15, 23, 42, 0.03), transparent 50%);
  padding-top: 5.25rem;
  padding-bottom: 0.5rem;
}

/* Fixed grain: pointer-events none, no blur on scroll containers */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.22;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 220px 220px;
  mix-blend-mode: soft-light;
}

body > * { position: relative; z-index: 1; }

.mono { font-family: var(--font-mono); }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  width: var(--container);
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Floating glass island nav */
.site-nav {
  position: fixed;
  top: 0.9rem;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  justify-content: center;
  padding: 0 1rem;
  pointer-events: none;
}

.nav-inner {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 52px;
  padding: 0.4rem 0.4rem 0.4rem 0.6rem;
  max-width: min(720px, 100%);
  width: 100%;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-card), var(--shadow-inset);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  transition: box-shadow var(--t-med) var(--ease-out-expo), border-color var(--t-fast) var(--ease-out-expo);
}

.nav-inner:hover {
  border-color: rgba(148, 163, 184, 0.42);
  box-shadow: var(--shadow-elev), var(--shadow-inset);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink-900);
  font-size: 15px;
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 0.5rem;
  object-fit: contain;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.9) inset, 0 0 0 1px rgba(15, 23, 42, 0.06);
}

.nav-links { margin-left: auto; display: inline-flex; align-items: center; gap: 0.2rem; }

.nav-links a {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink-500);
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-pill);
  transition: color var(--t-fast) var(--ease-out-expo), background var(--t-fast) var(--ease-out-expo), transform var(--t-fast) var(--ease-out-expo);
}

.nav-links a:hover { color: var(--ink-900); background: rgba(15, 23, 42, 0.05); }
.nav-links a:active { transform: scale(0.97); }

/* Buttons: pill primary + icon island */
.btn {
  --btn-bg: #fff;
  --btn-brd: rgba(148, 163, 184, 0.35);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  min-height: 48px;
  padding: 0 1.1rem 0 1.25rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--btn-brd);
  background: var(--btn-bg);
  color: var(--ink-700);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.85) inset;
  cursor: pointer;
  transition: transform 0.18s var(--ease-out-expo), background 0.22s var(--ease-out-expo), border-color 0.22s var(--ease-out-expo), box-shadow 0.3s var(--ease-out-expo);
}

.btn:hover { background: var(--paper-50); }
.btn:active { transform: scale(0.98); }

.btn-primary {
  --btn-bg: var(--accent-500);
  --btn-brd: hsl(220 86% 46%);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.2) inset, 0 8px 28px -8px rgba(37, 99, 235, 0.45);
  padding-right: 0.4rem;
}

.btn-primary:hover { background: var(--accent-600); --btn-brd: var(--accent-600); }
.btn-ico { display: inline-flex; align-items: center; justify-content: center; width: 2.1rem; height: 2.1rem; border-radius: 50%; background: rgba(255, 255, 255, 0.2); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25); transition: transform 0.35s var(--ease-out-expo); }
.btn-ghost .btn-ico { background: rgba(15, 23, 42, 0.06); box-shadow: none; }
.group:hover .btn-ico, .btn:hover .btn-ico { transform: translate(2px, -1px) scale(1.04); }
.btn svg { width: 17px; height: 17px; stroke-width: 1.5; }
.btn-primary svg { stroke: #fff; }
.btn-ghost svg { stroke: var(--ink-700); }

.btn-lg { min-height: 52px; font-size: 15px; padding-left: 1.35rem; }
.btn-ghost { --btn-bg: rgba(255, 255, 255, 0.65); }
.btn-ghost:hover { --btn-bg: #fff; }

/* Footer */
.site-footer { padding: 3rem 0 2.5rem; margin-top: 0; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 1.25rem 1.5rem; max-width: 1120px; margin: 0 auto; padding: 0 1rem; }
.footer-brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 700; letter-spacing: -0.02em; font-size: 14px; color: var(--ink-900); }
.footer-brand img { width: 26px; height: 26px; border-radius: 0.45rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; }
.footer-links a { font-size: 13px; color: var(--ink-500); font-weight: 500; padding: 0.35rem 0; border-bottom: 1px solid transparent; transition: color 0.2s var(--ease-out-expo), border-color 0.2s var(--ease-out-expo); }
.footer-links a:hover { color: var(--ink-900); border-bottom-color: rgba(37, 99, 235, 0.35); }
.footer-copy { margin-left: auto; font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-400); letter-spacing: 0.04em; text-transform: uppercase; }

@media (max-width: 540px) {
  .nav-links a { padding: 0.45rem 0.5rem; font-size: 11.5px; }
  .footer-copy { width: 100%; margin-left: 0; }
  body { padding-top: 4.8rem; }
  html { scroll-padding-top: 4.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .nav-inner, .nav-links a { transition-duration: 0.01ms !important; }
}